EP0342839B1 - Extrudeuse ayant un dispositif de réglage du degré de malaxage - Google Patents
Extrudeuse ayant un dispositif de réglage du degré de malaxage Download PDFInfo
- Publication number
- EP0342839B1 EP0342839B1 EP89304628A EP89304628A EP0342839B1 EP 0342839 B1 EP0342839 B1 EP 0342839B1 EP 89304628 A EP89304628 A EP 89304628A EP 89304628 A EP89304628 A EP 89304628A EP 0342839 B1 EP0342839 B1 EP 0342839B1
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- EP
- European Patent Office
- Prior art keywords
- screw
- extruder
- twin
- blocking wall
- screws
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
- B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
- B29B7/428—Parts or accessories, e.g. casings, feeding or discharging means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
- B29B7/483—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs the other mixing parts being discs perpendicular to the screw axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
- B29B7/489—Screws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
- B29C48/402—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/801—Valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92714—Degree of crosslinking, solidification, crystallinity or homogeneity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/268—Throttling of the flow, e.g. for cooperating with plasticising elements or for degassing
Definitions
- the present invention relates to an extruder incorporating a degree-of-kneading adjusting device.
- extruders In general, two types of extruders are known and in practical use, one being a single-screw extruder and the other a twin-screw type extruder.
- a cut is formed in a part of the flight of the screw.
- An inserting member protruding into the interior surface of extruder barrel in which the screw is received is positioned in the cut thus formed, the gap between the end portion of the inserting member and the screw being thereby adjusted.
- the gap between the slot of the screw and the slot of the cylinder is utilized to control the flow of raw material during operation, thereby to adjust the degree of kneading.
- the conventional device of JP-A-50 5450 is free from the above-described difficulties; however, it is still disadvantageous in that its degree-of-kneading controlling performance is not sufficient. Specifically, even if the gap between the inserting member and the screw is adjusted suitably, some of the resin will flow through paths other than the gap, and therefore it is difficult to control the whole flow of the resin as intended. That is, it is difficult to adjust the degree of kneading to a desired value according to physical and temperature properties of the resin.
- an object of this invention is to eliminate the above-described difficulties accompanying a conventional degree-of-kneading adjusting device in an extruder.
- JP-A-61241123 upon which the preamble of claim 1 is based, discloses a screw type extruder comprising one or more flighted screws located in an extruder barrel in which raw material is heated and kneaded whilst being fed down the barrel by the rotation of the or each screw for extruding the material, the extruder having a device for adjusting the degree of kneading, the or each screw having a cylindrical portion smaller in diameter than the flight of the screw; a blocking wall located around the cylindrical portion of the or each screw and dividing the barrel into upstream and downstream ends; at least one communication path for connecting the upstream end of the or each blocking wall with the downstream end; and, valve means disposed in the or each communication path for controlling the cross-sectional area of the communication path to vary the flow of material therethrough and adjust the degree of kneading of the material.
- the present invention is characterised over JP-A-61241123 in that the or each communication path substantially follows the flight of its corresponding screw.
- a single-screw extruder having a degree-of-kneeding adjusting device in which, according to the invention, a blocking wall is provided in the barrel hole of the extruder, and the degree of opening of a communicating path for communicating the upstream side of the blocking wall with the downstream side is controlled with a valve.
- the middle of the screw is formed into a cylindrical portion smaller in diameter than the flight thereof, a blocking wall smaller in diameter than the barrel bore so that it is engaged with the screw's cylindrical portion with a small gap therebetween, is provided at the position, in the axial direction, corresponding to the screw's cylindrical portion in the hole of the barrel in which the screw is inserted with a communicating path to guide resin flow from the upstream side of the blocking wall to the downstream side, and a valve is provided in the communicating path to control the degree of opening of the communicating path.
- the blocking wall may be in the form of a spiral continuous thread having two end portions which appear overlapped as viewed in the axial direction. In this case, the valve is provided between the two end portions of the spiral continuous thread.
- the molten raw material upstream of the blocking wall can flow downstream only through the communicating path provided with the valve.
- the area of communicating path can be controlled for all the degrees of opening ranging from complete closing of the path to full opening; that is, the degree of kneading can be adjusted to a desired value by controlling the degrees of the valve opening.
- a degree-of-kneading adjusting device for a twin-screw extruder in which, according to the invention, blocking walls are formed in the twin screw holes in the barrel, and communicating paths formed in the blocking walls are controlled in cross-sectional area. More specifically, the foregoing object of the invention has been achieved by the provision of a degree-of-kneading adjusting device for a twin-screw type extruder in which raw material fed into twin screw holes in the barrel in which the screws are inserted is heated and kneaded while being conveyed by two screws which are rotated in the same direction or counter rotational direction which being engaged with each other so as to extrude the resin.
- raw material fed into the screw channels is moving around along inside surfaces of the barrel as it is forwarded to downstream side.
- the typical flow pattern of the raw material is a gourd-shaped for co-rotating twin screw extruder and eight-shaped for counter rotating twin screw extruder.
- communicating path formed in the blocking wall is naturally different in co-rotating and counter rotating twin screw extruders to attain effective kneading.
- each of the screws has a cylindrical portion adjacent to downstream side of a kneading section, which portion is smaller in diameter than the flight thereof; blocking walls made smaller in diameter than other barrel so that the blocking walls are engaged with the cylindrical portions of the screws with small gaps therebetween are provided at a position, in the axial direction, corresponding to the cylindrical portions in the twin screw holes and arranged in such a manner as to divide the twin screw holes into upstream and downstream halves, the blocking walls being in the form of a spiral continuous thread, the direction of twist of which is determined so that the raw material is conveyed forwardly as the screws are rotated; communicating paths are formed in portions of the blocking walls, which portions are positioned between the twin screw holes to divide the twin screw holes, in such a manner that one of the communicating paths communicates the upstream side of the blocking wall on the side of one of the twin screw holes with the downstream side of the blocking wall on the side of the other of the twin screw holes, whereas the other communicating path
- each of the screws has a cylindrical portion at a part of the flight thereof in downstream side of a kneading section, the cylindrical portion being smaller in diameter than the flight; blocking walls made smaller in diameter than other walls so that the blocking walls are engaged with the cylindrical portions of the screws with small gaps therebetween are provided at a position, in the axial direction, corresponding to the cylindrical portions in the twin screw holes, and are in such a manner as to divide the twin screw holes into upstream and downstream sides, the blocking walls extending over the entire length of the cylindrical portions of the screws, communicating paths are formed in the blocking walls in such a manner that one of the communicating paths communicates the upstream side of the blocking wall on the side of one of the twin screw holes with the downstream side of the blocking wall on the side of the other of the twin screw holes, whereas the other communicating path communicates the upstream side of the blocking wall on the side of the other of
- the communicating paths are formed in the portions of the blocking wall, which portions are positioned at the upper parts of the respective screws, in such a manner that the raw material to be moved along the inner wall of the barrel to the blocking wall separating the twin-screw holes is forced to flow into the communicating path and flow out to the downstream side of the blocking wall.
- the communicating paths may be formed in the blocking wall at the upper and lower sides of each screw to communicate the upstream side of the blocking wall with the downstream side thereof in the barrel.
- the molten raw material forwarded to upstream side of the blocking walls can flow downstream only through the communicating paths provided with the valves.
- the area of communicating path is variable with the aids of the control valve.
- communicating path is narrowed by the control valve, the flow of resin through communicating path is restricted so that the filling ratio and residence time of raw material at kneading section increase and consequently the degree of kneading is raised.
- FIG. 1 A twin-screw extruder constructed in accordance with a first embodiment of this invention is shown in Fig. 1.
- This twin-screw extruder includes a barrel 10 formed by connecting a number of barrel units and two screws 12 and 13 inserted into the twin screw holes thereof (the screw 13 is not shown in Fig. 1).
- the twin-screw extruder further includes a first forwarding section 14, a kneading section 16, a degree-of-kneading adjusting section 18, a second forwarding section 20, a resin sealing section 22, a degassing section 24, a third forwarding section 26, and a metering section 28, which are arranged in the stated order in the direction of flow of raw material to be handled.
- the degree-of-kneading adjusting section 18, as shown in Figs. 2 and 3, has blocking walls 32 and 34 arranged in the twin screw holes formed in a barrel 30 composed of upper and lower halves.
- the inside diameters of the blocking walls 32 and 34 are slightly larger than the diameters of the cylindrical portions 12a and 13a (having no flight and having the same diameter as the bottom of the screw) of the screws 12 and 13, respectively.
- the blocking walls 32 and 34 are in the form of a helical continuous thread.
- the direction of twist of the helical continuous thread is such that, when the screws 12 and 13 are rotated counterclockwise in Fig. 2, the raw material is moved downstream of the blocking walls smoothly (or effectively).
- the blocking walls 32 and 34 extend about 360° .
- Communicating paths 38 and 40 are formed in partition walls 36 and 37 which divide the twin screw holes in the blocking walls 32 and 34, respectively.
- the communicating path 38 is constructed so as to communicate the upstream side of the blocking wall 32 in the hole on the side of the screw 12 with the downstream side of the blocking wall 34 in the hole on the side of the screw 13, whereas the communicating path 40 is designed so as to communicate the upstream side of the blocking wall 34 in the hole on the side of the screw 13 with the downstream side of the blocking wall 32 in the hole on the side of the screw 12. That is, the communicating paths 38 and 40 are holes formed in the barrel from above and below in Fig. 2.
- Valves (a sort of butterfly valve ) 42 and 44 are rotatably arranged on pivots 46 and 48.
- Fig. 2 shows the valves 42 and 44 communicating the twin screw holes with each other.
- the valves 42 and 44 are turned through 90° , the twin screw holes are not communicated with each other.
- the valves 42 and 44 are turned in opposite directions through a mechanism as shown in Fig. 4. This will be described in more detail.
- a sector-shaped gear 52 is arranged so as to turn with a shaft 50 which is rotated together with the lower valve 44.
- the gear 52 is meshed with a gear 54, which is coupled through a shaft 56 to a bevel gear 58.
- the bevel gear 58 is meshed with a gear 62 which is turned with a handle 60.
- the upper valve 42 is coupled through a sector-shaped gear 64, a gear 65 and a bevel gear 66 to the bevel gear 62. Therefore, when the handle 60 is rotated, the valves 42 and 44 are turned in opposite directions.
- the raw material put in the barrel 10 of the extruder is moved form the upstream end to the downstream end, or to the right in Fig. 1, by the screws 12 and 13. Since the screws 12 and 13 are rotated in the same direction, the flow pattern of raw material is, as shown in Fig. 17, gourd-shaped along the inner walls of the twin screw holes in one direction only, as viewed at cross section of the screws that is, the resin will not flow cross-wise.
- the degree-of-kneading adjusting section 18 restricts the flow of raw material so that the raw material at the kneading section 16 is suitably kneaded. That is, the handle 60 is operated to run the valves 42 and 44 to adjust the cross-sectional areas of the communicating paths 38 and 40 between the twin screw holes to desired values, thereby to control the flow area of the raw material.
- the communicating paths 38 and 40 are designed so as to guide the above-described flow of raw material along the inner walls.
- the valve 42 is shown positioned so that the communicating paths are largest in cross-sectional area.
- the valves 42 and 44 are turned, the cross-sectional areas can be decreased.
- the communicating paths 38 and 40 are substantially completely closed.
- the resin is accumulated in the kneading section 16, where it is kneaded in the molten state while being greatly sheared.
- the degree of kneading of the resin depends on how long the resin is held in the kneading section 16. Substantially all of the resin must pass through the communicating paths 38 and 40. Therefore, the degree of kneading can be adjusted to a desired value by controlling the degrees of opening of the communicating paths.
- the blocking walls are in the form of the spiral continuous thread, as was described above, along which the resin flows smoothly. As a result, the resin will not locally accumulate.
- valves 42 and 44 are turned to control the cross-sectional areas of the communication paths; however, they may be modified so as to move vertically in Fig. 4. with the valves thus modified, the cross-sectional areas of the communicating paths between the twin screw holes can also be effectively controlled.
- the second embodiment has blocking walls 33 and 35 extending vertically.
- the blocking walls 33 and 35 are provided over the entire length of the cylindrical portions 12a and 13a of the screws 12 and 13; in other words, the cylindrical portions 12a and 13a having no flight are, over their entire length, fitted in the blocking walls 33 and 35 in such a manner that the end faces 12b and 13b, on the sides of the cylindrical portions, of the flights are confronted with the respective blocking walls 33 and 35 with small gaps therebetween.
- Communicating paths 39 and 41 are formed in the blocking walls 33 and 35.
- the communicating path 39 is formed so as to communicate the upstream side of the blocking wall 33 in the hole on the side of the screw 12 with the downstream side of the blocking wall 35 in the hole on the side of the screw 13, whereas the communicating path 41 communicates the upstream side of the blocking wall 35 in the hole on the side of the screw 13 with the downstream side of the blocking wall 33 in the hole on the side of the screw 12.
- valves 43 and 45 are provided in the communicating paths 39 and 41, respectively (the valve 45, not shown, being similar in construction to the valve 43).
- the twin screw holes are communicated with each other. When, from this condition, they are turned through 90°, the twin screw holes are prevented from communicating with each other.
- the valves 43 and 45 are turned in opposite directions by a mechanism similar to that shown in Fig. 4 for the first embodiment.
- the degree of kneading can be accurately controlled by adjusting the degrees of opening of the valves 43 and 45.
- the resin even if the resin is considerably low in fluidity, it will never stagnate around the blocking walls 33 and 35. This is because the screws are rotated with the flight end faces 12b and 13b held adjacent to the blocking walls 33 and 35, and therefore the resin near the blocking walls 33 and 35 is agitated and conveyed. In this operation, the resin is further sheared in the small gaps between the flight end faces 12b and 13b and the blocking walls 33 and 35.
- a third embodiment is shown in Figs. 10 through 12, in which the inventive concept is applied to a single-screw extruder.
- a blocking wall 33 is in the form of a spiral continuous thread.
- the direction of twist of the spiral continuous thread is so determined that when the screw 12 is rotated, the raw material is moved form the upstream end to the downstream end (i.e. downward in Fig. 12).
- the continuous thread spirals about 360° around the cylindrical parts of screws, and its circumferential end portions form both side walls of communicating path.
- a hole-shaped communicating path 39 is provided between the circumferential end portions of the spiral continuous thread.
- a vertically movable valve 43 is provided in the communicating path 39.
- the resin is forced to flow from the upstream end to the downstream end of thread.
- substantially all of the resin passes through the communicating path 39.
- the cross-sectional area of the communicating path 39 can be adjusted with the valve 43, and therefore the degree of kneading can be accurately adjusted to a desired valve.
- the blocking wall 33 is in the form of a spiral continuous thread, and the resin flows smoothly along the blocking wall; that is, the resin will never accumulate locally.
- Figs. 13 through 16 are the other embodiments of this inventive concept applied to a counter rotating twin-screw extruder. Since screw 12 and 13 are rotated in the counter direction, the flow pattern of raw material is, as shown in Fig. 18, 8-shaped along the inner walls of the twin screw holes as viewed at the cross section of the barrel. Therefore, the blocking walls and the communicating paths are different from the embodiments in the co-rotating twin extruder. That is, in the counter rotating extruder, the resin will flow in a cross-wise. Accordingly, the valves are effectively arranged to make the best use of these characteristics. In Fig. 13, four valves 102, 104, 106 and 108 are provided to possibly decrease the resistance at the blocking walls.
- the communicating paths 112, 114, 116 and 118 for communicating the upstream side of said blocking wall with the downstream side thereof in said barrel are formed in the blocking walls 122, 124, 126 and 128 at the upper and lower sides of each screw, respectively.
- a valve 102 In the counter-rotating twin-screw extruder in Figs. 15 and 16, there are provided a valve 102 and two communicating paths 112 and 116.
- the communicating paths 112 and 116 are formed in the portions of the blocking walls 122 and 126, which portions are positioned at the upper parts of the respective screws in such a manner that raw material to be moved along the inner wall of the barrel to the blocking walls separating the twin-screw holes is forced to flow into the communicating paths and flow out to the downstream side of the blocking walls.
- communicating paths are formed in the blocking walls between the twin screw holes, which paths are controlled in cross-sectional area by the valves with the result that the degree of kneading can be adjusted as desired.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Claims (7)
- Extrudeuse du type à vis, comprenant une ou plusieurs vis (12, 13) à spire placées dans un corps (10) d'extrudeuse, dans laquelle une matière première est chauffée et malaxée tout en avançant le long du corps sous l'action de la rotation de la vis ou de chaque vis afin que la matière soit extrudée, l'extrudeuse ayant un dispositif d'ajustement du degré de malaxage,
la vis ou chaque vis ayant une partie cylindrique (12a, 13a) de diamètre inférieur à celui de la spire de la vis,
une paroi de blocage (32, 34) placée autour de la partie cylindrique de la vis ou de chaque vis et divisant le corps en extrémités amont et aval,
au moins un trajet de communication (38, 40) destiné à raccorder l'extrémité amont de la paroi ou de chaque paroi de blocage à l'extrémité aval, et
un dispositif obturateur (42, 44) placé dans le trajet ou chaque trajet de communication et destiné à régler la section du trajet de communication (38, 40) afin qu'il fasse varier le débit de matière et ajuste le degré de malaxage de la matière, caractérisée en ce que
le trajet ou chaque trajet de communication suit pratiquement la spire de la vis correspondante. - Extrudeuse selon la revendication 1, dans laquelle l'extrudeuse est une extrudeuse à deux vis tournant dans le même sens, ayant deux vis (12, 13) placées dans des trous du corps de l'extrudeuse, les deux vis tournant dans le même sens, la partie cylindrique (12a, 13a) de chaque vis étant placée près du côté aval d'une section de malaxage (16), l'extrudeuse ayant une paroi de blocage qui coopère avec les parties cylindriques de chaque vis avec des petits espaces intermédiaires, disposés de manière que chacun des trous des deux vis soit divisé en extrémités amont et aval, les parois de blocage (32, 34) étant sous forme d'un filet hélicoïdal continu, le sens de ce filet étant déterminé de manière que, lorsque les vis tournent, la matière première soit transportée vers l'avant, vers les trajets de communication qui sont placés entre les deux trous des parois de blocage,
l'un de trajets de communication raccordant l'extrémité amont de la paroi de blocage de l'un des trous des deux vis à l'extrémité aval de la paroi de blocage de l'autre des trous des deux vis, et l'autre trajet de communication reliant l'extrémité amont de la paroi de blocage de l'autre trou des deux vis à l'extrémité aval de la paroi de blocage du premier trou de vis. - Extrudeuse selon la revendication 1, dans laquelle l'extrudeuse est une extrudeuse à deux vis tournant dans le même sens ayant deux vis (12, 13) placées dans des trous du corps de l'extrudeuse, les deux vis étant entraînées dans le même sens, la partie cylindrique (12a, 13a) de chaque vis étant placée près d'un côté aval d'une section de malaxage (16), l'extrudeuse ayant une paroi de blocage qui coopère avec la partie cylindrique de chaque vis avec interposition de petits espaces, les parois de blocage étant disposées de manière que chacun des trous des deux vis soit divisé en extrémités amont et aval, les parois de blocage étant disposées sur toute la longueur des parties cylindriques des vis,
les trajets (38, 40) de communication étant formés dans les parois de blocage de manière que l'un des trajets de communication raccorde l'extrémité amont de la paroi de blocage de l'un des trous des deux vis à l'extrémité aval de la paroi de blocage de l'autre des trous deux vis, et l'autre trajet de communication raccorde l'extrémité amont de la paroi de blocage de l'autre trou de vis à l'extrémité aval de la paroi de blocage du premier trou de vis. - Extrudeuse selon la revendication 1, telle que l'extrudeuse est une extrudeuse à une seule vis.
- Extrudeuse selon la revendication 4, dans laquelle la paroi de blocage est sous forme d'un filet hélicoïdal continu dont le sens de torsion est déterminé de manière que la matière première se déplace vers l'avant lorsque la vis tourne, le filet hélicoïdal continu étant placé circonférentiellement autour de la vis sur 360° environ de manière que les deux parties d'extrémité se recouvrent en direction axiale de la vis, le dispositif obturateur étant placé entre les deux parties d'extrémité du filet hélicoïdal continu.
- Extrudeuse selon la revendication 1, dans laquelle l'extrudeuse est une extrudeuse du type à deux vis tournant en sens inverses, ayant deux vis (12, 13) placées dans les trous du corps de l'extrudeuse, les deux vis tournant en sens opposés afin que la matière soit extrudée, la partie cylindrique (12a, 13a) de chaque vis étant adjacente à un côté aval d'une section de malaxage (16), l'extrudeuse ayant une paroi de blocage coopérant avec les parties cylindriques de chaque vis avec interposition de petits espaces, les parois étant disposées de manière qu'elles divisent chacune un trou d'une des deux vis en extrémités amont et aval, l'extrudeuse ayant des trajets de communication destinés à faire communiquer l'extrémité amont des parois de blocage de l'extrémité aval de celles-ci de chaque côté de la vis.
- Extrudeuse selon la revendication 1, telle que l'extrudeuse est une extrudeuse à deux vis tournant en sens inverses, comprenant deux vis (12, 13) placées dans des trous du corps de l'extrudeuse, les deux vis tournant en sens opposés afin qu'elles extrudent la matière, la partie cylindrique (12a, 13a) de chaque vis étant adjacente au côté aval d'une section de malaxage (16), l'extrudeuse ayant une paroi de blocage qui coopère avec la partie cylindrique d'une des vis avec interposition de petits espaces, les parois étant disposées afin qu'elles divisent les trous des deux vis en extrémités amont et aval, l'extrudeuse ayant des trajets de communication destinés à faire communiquer l'extrémité amont des parois de blocage à l'extrémité aval d'un côté uniquement des deux vis.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11812288 | 1988-05-17 | ||
JP118122/88 | 1988-05-17 | ||
JP193450/88 | 1988-08-04 | ||
JP63193450A JPH0248920A (ja) | 1988-05-17 | 1988-08-04 | 2軸同方向回転押出機の混練度調整装置 |
JP63243925A JPH0292516A (ja) | 1988-09-30 | 1988-09-30 | 単軸押出機の混練度調整装置 |
JP243925/88 | 1988-09-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0342839A2 EP0342839A2 (fr) | 1989-11-23 |
EP0342839A3 EP0342839A3 (fr) | 1991-01-02 |
EP0342839B1 true EP0342839B1 (fr) | 1994-01-26 |
Family
ID=27313507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89304628A Expired - Lifetime EP0342839B1 (fr) | 1988-05-17 | 1989-05-08 | Extrudeuse ayant un dispositif de réglage du degré de malaxage |
Country Status (5)
Country | Link |
---|---|
US (1) | US5145251A (fr) |
EP (1) | EP0342839B1 (fr) |
BR (1) | BR8902270A (fr) |
CA (1) | CA1306838C (fr) |
DE (1) | DE68912642T2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107405790A (zh) * | 2015-03-27 | 2017-11-28 | 株式会社日本制钢所 | 多轴搓揉机 |
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IT1246782B (it) * | 1991-04-15 | 1994-11-26 | Pomini Farrel Spa | Macchina per l'estrusione di polimeri termoplastici e simili comprendente un mescolatore interno. |
US5358681A (en) * | 1993-04-28 | 1994-10-25 | Rohm And Haas Company | Backseal extruder |
US5573332A (en) * | 1993-09-02 | 1996-11-12 | Werner & Pfleiderer Gmbh | Screw element for a screw-like extrusion machine |
IT1283652B1 (it) * | 1996-08-02 | 1998-04-23 | Pomini Spa | Procedimento per la mescolazione ed estrusione in continuo di materiali polimerici con pre-mescolazione a secco del materiale e |
EP1075377B1 (fr) * | 1998-05-07 | 2003-10-01 | Ato Bv | Procede et appareil de production en continu de composites de polymere et de fibres cellulosiques |
JP2003523849A (ja) * | 2000-02-24 | 2003-08-12 | ベルシュトルフ ゲゼルシャフト ミット ベシュレンクテル ハフツング | ブリスタを有する押出機 |
DE10012532A1 (de) * | 2000-03-15 | 2001-09-27 | Remaplan Anlagenbau Gmbh | Verfahren zum Spritzpressen von Kunststoffmischungen, insbesondere Kunststoffmischungen aufweisend mindestens eine thermoplastische Plyesterkomponente und mindestens eine Modifierkomponente, insbesondere deren Recyclate sowie Vorrichtung zum Durchführen des Verfahrens |
KR20030019326A (ko) * | 2000-03-21 | 2003-03-06 | 니뽄 신야쿠 가부시키가이샤 | 방출 제어형 경구 투여 제제 |
US20030025236A1 (en) * | 2001-08-01 | 2003-02-06 | Xerox Corporation | Toner extruder feed apparatus |
DE10339352A1 (de) * | 2003-08-25 | 2005-03-24 | Bühler AG | SME-Steuerung für die Verarbeitung stärkehaltiger Produkte |
DE102005010315A1 (de) * | 2005-03-03 | 2006-09-07 | Bühler AG | Verfahren und Anlage zur Herstellung stärke-, fett- oder proteinbasierter Nahrungs- oder Futtermittel mit definiertem Schüttgewicht |
JP3854298B1 (ja) * | 2005-07-11 | 2006-12-06 | 株式会社神戸製鋼所 | 噛合型2軸押出機の混練度調整装置 |
AU2005334397B2 (en) * | 2005-07-12 | 2009-08-20 | Borealis Technology Oy | Counter-rotating twin screw extruder |
US20070183254A1 (en) * | 2005-10-25 | 2007-08-09 | Desider Schobert-Csongor | Infinitely variable shear mixer apparatus |
US20070237022A1 (en) * | 2006-04-11 | 2007-10-11 | Wiltz Philip B | Extruder mid-barrel adjustable valve assembly |
US20070237850A1 (en) * | 2006-04-11 | 2007-10-11 | Wenger Manufacturing, Inc. | Extruder mid-barrel adjustable valve assembly |
US20080267003A1 (en) * | 2007-04-24 | 2008-10-30 | Shashank Gulabchand Kasliwal | Extrusion method and apparatus |
JP5005506B2 (ja) * | 2007-11-02 | 2012-08-22 | 株式会社神戸製鋼所 | 混練度調整方法 |
US7635217B2 (en) * | 2008-01-03 | 2009-12-22 | Wenger Manufacturing, Inc. | Extruder having variable mid-barrel restriction and adjacent high intensity mixing assembly |
JP5430124B2 (ja) * | 2008-10-31 | 2014-02-26 | 株式会社神戸製鋼所 | 混練度調整装置及び混練度調整方法 |
JP6465091B2 (ja) * | 2016-09-30 | 2019-02-06 | トヨタ自動車株式会社 | 二軸押出混練装置およびそれを用いた電極ペーストの製造方法 |
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DE631436C (de) * | 1936-06-20 | Oskar Winicker Dipl Ing | In Teilstuecke geteilte Vorlage fuer Strangpressen, insbesondere fuer entlueftende Strangpressen | |
LU38223A1 (fr) * | 1959-04-10 | 1900-01-01 | ||
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CH423082A (de) * | 1963-03-29 | 1966-10-31 | Lilon Establishment | Vorrichtung, bestehend aus einer Schneckenpresse und einer nachfolgenden Zahnradspinnpumpe, zur Herstellung von Fäden oder Fadenbündeln |
US3475787A (en) * | 1968-03-06 | 1969-11-04 | Nrm Corp | Extruder |
DE2243039C3 (de) * | 1972-09-01 | 1980-08-14 | Werner & Pfleiderer, 7000 Stuttgart | Kontinuierlich arbeitender Schnekkenknetmischer |
US3823921A (en) * | 1972-11-14 | 1974-07-16 | Teledyne Inc | Continuous processor for treating material |
FR2325278A7 (fr) * | 1973-02-27 | 1977-04-15 | Werner & Pfleiderer | Element de cisaillage pour boudineuse utilisable pour la preparation des matieres plastiques |
US4103355A (en) * | 1974-04-08 | 1978-07-25 | Fried. Krupp Gesellschaft Mit Beschrankter Haftung | Mixing extruder |
CA1073170A (fr) * | 1975-11-28 | 1980-03-11 | David B. Todd | Machine a tambours multiples pour le traitement continu, de materiaux munie d'une selle orientable de regulation d'ecoulement |
CH632445A5 (en) * | 1978-10-18 | 1982-10-15 | Baker Perkins Inc | Machine for the continuous processing of a viscous composition |
DE3042427C2 (de) * | 1980-11-11 | 1983-04-07 | Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover | Doppelschneckenstrangpresse zum Verarbeiten von thermoplastischen Formmassen, insbesondere Kunststoffen |
DD158014A1 (de) * | 1981-04-07 | 1982-12-22 | Plast Elastverarb Ingbetrieb | Vorrichtung zum entfernen gasfoermiger bestandteile aus polymeren werkstoffen |
US4462691A (en) * | 1983-01-13 | 1984-07-31 | Uniroyal, Inc. | Mixer/extruder having selectively variable shearing action therein |
DE3407789A1 (de) * | 1983-03-18 | 1984-10-25 | Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid | Schneckenextruder |
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-
1989
- 1989-05-08 DE DE68912642T patent/DE68912642T2/de not_active Expired - Fee Related
- 1989-05-08 EP EP89304628A patent/EP0342839B1/fr not_active Expired - Lifetime
- 1989-05-16 BR BR898902270A patent/BR8902270A/pt not_active IP Right Cessation
- 1989-05-17 CA CA000599971A patent/CA1306838C/fr not_active Expired - Fee Related
-
1990
- 1990-10-31 US US07/607,799 patent/US5145251A/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107405790A (zh) * | 2015-03-27 | 2017-11-28 | 株式会社日本制钢所 | 多轴搓揉机 |
CN107405790B (zh) * | 2015-03-27 | 2019-09-03 | 株式会社日本制钢所 | 多轴搓揉机 |
Also Published As
Publication number | Publication date |
---|---|
US5145251A (en) | 1992-09-08 |
DE68912642D1 (de) | 1994-03-10 |
DE68912642T2 (de) | 1994-06-23 |
EP0342839A3 (fr) | 1991-01-02 |
CA1306838C (fr) | 1992-09-01 |
BR8902270A (pt) | 1990-03-01 |
EP0342839A2 (fr) | 1989-11-23 |
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